smime.el (smime-decrypt-region): Doc fix.

diff --git a/lisp/gnus/smime.el b/lisp/gnus/smime.el
index 0695d5ac82e8da0407b9f0af49d4eb93f45f3b7e..27db3e35e20455db22f7e347b37ea412d5c4beea 100644 (file)
--- a/lisp/gnus/smime.el
+++ b/lisp/gnus/smime.el
@@ -428,6 +428,7 @@ Any details (stdout and stderr) are left in the buffer specified by
 
 (defun smime-decrypt-region (b e keyfile &optional from)
   "Decrypt S/MIME message in region between B and E with key in KEYFILE.
+Optional FROM specifies sender's mail address.
 On success, replaces region with decrypted data and return non-nil.
 Any details (stderr on success, stdout and stderr on error) are left
 in the buffer specified by `smime-details-buffer'."